The butterknife library is outdated and the project does not compile and give way many errors. What am i supposed to do?

The latest build tools require you have an annotationProcessor entry for any library that uses one, like ButterKnife, along with the compile entry.

dependencies {
    compile 'com.jakewharton:butterknife:7.0.1'
    annotationProcessor 'com.jakewharton:butterknife:7.0.1'
    // ...
}

Can you post your code or further information? If the course uses an outdated version of the library you can download that same version. However, you should read the documentation for the newer release sometimes methods and functions change names or are implemented differently. You should still be able to use the newer library.

I see what you are talking about. Have you tried to change the app build.gradle to match the projects?

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:recyclerview-v7:23.1.1'
    compile 'com.jakewharton:butterknife:7.0.1'
    compile 'com.jimulabs.mirrorsandbox:mirror-sandbox:0.2.1'
    compile 'com.android.support:palette-v7:23.1.1'
}

This should work if Jake still has the repo up for that version. If not i am currently analayzing the docs maybe i will take a crack at it. However if this issue is not resolved i suggest we both write to treehouse about it.

You now need to add butterknife-compiler to the annotation processor!

dependencies {
  implementation 'com.jakewharton:butterknife:8.8.1'
  annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'
}